A small piece the magnesium ribbon is inserted in a Petri food containing 1M hydrochloric acid. Because that a huge audience presentation, this demonstration have to be perceived via a camera or document camera. Students observe bubbles of hydrogen gas forming.

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There are countless places in the curriculum wherein this demonstration can be used. It is most commonly used when discussing the characteristic reaction of either metals or acids. It's also a an excellent example the a single replacement reaction (an oxidation-reduction reaction) when discussing species of reactions. This demonstrate may additionally be performed using a file projector if a dark elevator is used. Allow about 5 minutes because that this demo. A computer system simulation is easily accessible to compliment and also enhance this demonstration.

Learning Objectives

1. Magnesium steel is an energetic metal. Magnesium will certainly react v hydrochloric acid.

2. Illustration the a solitary displacement reaction. Illustration of an oxidation-reduction reaction. Illustration that a reaction the produces a gas.

3. Write a well balanced chemical equation and also a network ionic equation.


Lead Time
One work of lead time is required for this project.
Discussion

Magnesium reacts with hydrochloric mountain according to the equation: Mg(s) + 2 HCl(aq) -->MgCl2(aq) + H2(g) This demonstration can be used to show the characteristics reaction of metals with acid, a solitary replacement reaction, or to show the generation that hydrogen gas. The flammability that hydrogen gas deserve to be prove by carefully holding a match or fireplace lighter approximately the popping hydrogen bubbles. An audible crackling sound is heard together the hydrogen burns.

The net ionic equation for this reaction is:Mg(s) + 2H+(aq) -->Mg2+(aq) +H2(g)


Petri dish1cm piece of magnesium ribbonwash bottle containing 1M HClforcepsoverhead projector(Optional) butane fireplace lighter

Mechanics of presenting this demonstration

Turn ~ above the camera and also focus it. Place the Petri food on the overhead projector. Pour hydrochloric acid right into the Petri food to a depth of about 5 mm. Utilizing forceps, location the magnesium ribbon into the Petri dish. The magnesium reacts v the acid, developing visible bubbles of hydrogen gas.

(Optional) If the fire of a butane fireplace lighter is held over the bursting bubbles, castle will produce audible pops together the hydrogen ignites.


Magnesium ribbon is a flammable solid. Hydrochloric mountain is a corrosive liquid. Hydrogen gas is explosive. However, the very little quantities and low dilutions offered in or created by this demo present little hazard. Wear security goggles. Store flammables and open flame far from the vicinity of the demo.


1. B.Z. Shakhashiri;Chemical Demonstrations: A Handbook because that Teachers the Chemistry; Wisconsin; 1985; Volume 1; p. 25-26.


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